Ok, so you have an Intel Dual Core E5300 CPU. The default front side bus speed of this CPU is 800Mhz. So, first you take the 800Mhz and divide by 4 since the INtel CPU's are quad pumped. (800 / 4 = 200mhz). Therefore, you have a default FSB speed of 200Mhz for your motherboard with a 13x multiplier for an E5300 chip, getting it up to it's default clock speeds (200 x 13 ) = 2,600Mhz.
Now, with Double Data Rate RAM, you take the FSB speed of the mobo (200Mhz) and you double it. (200 x 2 = 400Mzh). Therefore, if you really want a 1:1 ratio, you would be running your RAM at 400Mhz instead of 1,333Mhz...which is probably a lot slower than you want.
You have a few options, use dividers instead of a 1:1 ratio and run your RAM at higher speeds. Or, you have to try to overclock that CPU and get it's FSB increased (a lot). To get a 1:1 ratio with this method, you would have to increase your FSB speed to 667Mhz from 200, but with a 13x multiplier, you would be running at 8.6Ghz. If you can reduce your multiplier, you can lower those speeds...but I'd strongly suggest having a fire extinguisher handy as your chip isn't going to handle that.
I'm running my Q9550 with DDR2 ram at a 1:1 ratio but it is much easier. The Q9550 has a quad pumped FSB of 1333Mhz. (1333 / 4 = 333Mhz). My FSB speed stock is 333Mhz with an 8.5x multiplier. (333 x 8.5 = 2,833Mhz). So, my RAM by default would run at 667Mhz (333 FSB x 2= 667Mhz). So, DDR2-667 would be the appropriate RAM for stock speeds. Well, I used DDR2-800 RAM instead of DDR2-667 and this allowed me to increase my FSB on my mobo from 333Mhz to 400Mhz. So now my CPU runs at 3.4Ghz (400 x 8.5 = 3400Mhz), and my RAM is running at 800Mhz (400 x 2). So, nice and easy 1:1 ratio here.
RAM ratio but i dont know how and what to set it? Is 1:1 ratio good or bad for my system? I have intel dual core E5300 and 4 gb 1333 mhz DDR3.
